Kevin Durant scored a career-best 51 points for the top performance in the NBA this season, Russell Westbrook added 40 and Serge Ibaka had his first career triple-double as the Oklahoma City Thunder beat the Denver Nuggets 124-118 Sunday night. Durant hit a 3-pointer and drove for a dunk to tie the game with 4.4 seconds left in regulation, then used the extra period to chalk up the first 50-point...